# -*- coding: utf-8 -*-
"""
@Project: base_python
@File: ship.py
@Author: PC
@Date: 2025/2/13
@Description: 
"""
import pygame
from pygame.sprite import Sprite


class Ship(Sprite):
    def __init__(self, ai_settings, screen):
        super().__init__()       
        """初始化飞船并设置其初始位置"""
        self.screen = screen
        self.ai_settings = ai_settings
        # 加载飞船图像并获取其外接矩形
        self.image = pygame.image.load('alieninvasion/images/ship.bmp')
        self.rect = self.image.get_rect()
        self.screen_rect = screen.get_rect()
        # 将每艘新飞船放在屏幕底部中央
        self.rect.centerx = self.screen_rect.centerx
        self.rect.bottom = self.screen_rect.bottom
        # Store a decimal value for the ship's center.
        self.center=float(self.rect.centerx)
        self.moving_right = False
        self.moving_left = False



    def update(self):
        """根据移动标志调整飞船的位置"""
        if self.moving_right  and self.rect.right < self.screen_rect.right :
            self.center+= self.ai_settings.ship_speed_factor
        if self.moving_left and self.rect.left > 0:
            self.center-= self.ai_settings.ship_speed_factor
        self.rect.centerx=self.center

    def blitme(self):
        """在指定位置绘制飞船"""
        self.screen.blit(self.image, self.rect)
    def center_ship(self):
        """让飞船在屏幕上居中"""
        self.center = self.screen_rect.centerx